Automatic air moisteheb foe hot-aie jfubnaces



Jan. 18, 1927. 1,614,478

K. w. LARKIN AUTOMATIC AIR MOISTENER FOR HOT AIR FURNACES Filed Dec. 191925 INVEN TOR. /(e- M Mex/M A TTORNE Y.

Patented Jan. 18, 1927.

, UNITED STATES KERN WILLIAM LARKIN, or DETROIT, nioi rsan.

; AUTOMATIC-AIR nois'rnnnn non HOT-AIR FURNACES. 2

Application filed December This invention relates to automatic airmoisteners for hotairfurnaces and the object of the invention is toprovide an air moistenerconsisting of a water pan adapt ed to be positoned in the hot air chamber of the furnace and in which the opening ofthe fire door of the furnace causes the pan to fill with water. r IAnother object of the invention is to provide a device of the characterdescribed in which the. pan is filled with water during the period whichthe fire door'is opened.

A further objectof the invention is to provide a waterpan containing afloat valve for maintaining a water level in. the water an the saidfloat valve 0 eratin subsequent to opening of the fire door of thefurnace which through a valve arrangement allows flow of water to thefloat valve;

These objects and the several novel features of the invention arehereinafter more fully described and claimed and the preferred form ofconstructionby which these objects are attained is shown intheaccompanylng drawing in. which' Fig. '1 is a front elevation of a hotair furnace with my air moistener as utilized 7 therewith.

Fig. 2 is an enlarged section through the air moistener showing itsconnection with the fire door of the furnace.

Fig. 3 is a plan view of the float operated valve within the'water pan.

Fig. 4 is a section taken on line 44 of Fig. 3.

Fig. 5 is an enlarged section taken on line 55 of Fig. 2. I

As shown in Fig. 1 the hot air furnace 1 is provided with a water pan 2.The end of this water pan extends from the front of the furnace to aslight extent and is usually provided with a cover extending outwardlyfrom the front of the furnace. This pan ex tends inwardly into the hotair chamber of the furnace and is open at the top within the furnace.The water pipe 3 for supplying water to the pan 2 is provided with avalve 4 therein as shown in Figs. 1 and 2. This valve is of a quickcompression type and is provided with threads 5 so that when thevalve'is turned in either direction it may be quickly opened and closed.The valve 4 is provided with a round stem 6 having a square recess? toreceive the squared end 8 of the rod 9. The rod 9 extends upwardlythrough the two lugs 10 and 11 which e valve 27 from its seat.

19, 1925. Serial in). 76,551.

tend outwardly from the door frame of the furnace. This rod 9 forms thepivot for the fire door 12 which is provided with twolugs13 and 14. Thelug 13 is'provided with a round aperture for the stem 9 while the lug 14is provided with a square aperture. The upper end 15 of the stem 9 issquared as shown in Fig. 5 where it extends through the lug 14 and ascrew 16 is threaded intothis squared end as shown in Figs. 2 and 5.

By this arrangement when the fire door is opened the rod 9 is turnedtherewith, thus opening the valve 4 and when the fire door is closed thevalve 4 is closed. A pipe 17 leads from the outlet of the valve bodyinto the water pan 2 and is provided with a float controlled valve onthe end thereof within thecpan. This valve comprises a float 18 having astem 19 which is pivoted at 20 and a link21 is pivoted at 22. to the endof the arm 19. This link is pivoted at 23 to an arm 24 which extendsthrough the valve member 25 as shown in Figs. 3and 4.

At the opposite end the arm 24 pivoted on the bolt 26 so'that as the arm24 is lowered M the valve 27 on-the' valve member 25closes the valveseat'28 to prevent further flow of water; vAs the float l8 falls due toevaporation of water from the pan 2, the end of the arm :19 is raisedandthrough means of the link 21 the arm 24 is raised, thus lifting theWhen the valve 27 .is opened as shown in Fig. 2 water will not flow intothe pan 2 until the fire door 1.2 of the furnace is opened to open thevalve 4. When this valve 4 is opened by opening the I am aware'thatthere are other devices ,flre door the water will rush through, the

which utilize a float valve for filling the overcome the defectsof thistype of con-' struction. By providing a valve 4 controlled by thefurnace fire .door which is always opened for firing the furnace atleast once a day, the evaporation between operations of the valve 4lowers the level in the pan to considerable extent so that when thevalve 4 is opened by the fire door the water flows in with a rush whichquickly brings the Water level to the proper height. Upon again closingthe fire door the valve at is closed so that subsequent opening of thefloat control valve does not allow water to pass into the pan until thefire door isagain Opened. 'It will thus be readily seen that the floatvalve is usually wide open when the :Water is added to the pan byopening the :fire door and thus the pitting of the valve seat by atrickling flow of water will not occur.

From the foregoing description it becomes evident that :the device isvery simple and eflicient in operation, is automatic in that it requiresno attention except that usually given in firing a furnace, willovercome the objections of previous devices of this type and provides adevice which accomplishes the objects described.

Having-thus fully described my invention,

its utility :and mode of operation, what I claim vand desire to secureby Letters Patent of the United States is 1. An automatic .air moistenerfor hot air furnaces comprising a water pan Open to the hot air chamberof the furnace, a pipe for supplying Water to the pan, a valve in thesaid pipe, the valve having a stem provided with a squared recess, a rodhaving a squared end fitting in the said recess, the rod being securedto the furnace fire door and forming a. pivot for the said door,

whereby, as the door is opened the valve is opened-and as the door is:closed the valve is closed and a float controlled valve on the end ofthe said pipe within the water pan.

2. An automatic air moistener for hot air furnaces comprising a Waterpan open to the hot air chamber of the furnace, a pipe for supplying-water to the pan, a valve in the said pipe, the valve having a stemprovided with a squared recess, .arod having asquared end fitting in thesaid recess, the rod being secured to the furnace fire door, whereby, asthe door is opened the valve is opened and as the door is closed thevalve is closed and a float controlled valve on the end of the said pipewithin the Water pan.

3. An automatic air moistener for hot air furnaces comprising a waterpan :open to the hot air chamber of the furnace, a :pipe for supplyingwater to the water pan, -a valve in the said pipe, 'a rod connected withthe valve and secured to the furnace fire door, whereby, when the dooris closed the valve is closed and when the door is opened the valve isopened and a float controlled valve on the end of the said pipe Withinthe water pan.

4. An automatic air moistener for hot air furnaces comprising a waterpan open to the hot air chamber of the furnace, a pipe for supplyingwater to the water pan, a valve in the said pipe connected for operationby the furnace door, the said valve being closed when the furnace dooris closed and being opened When the furnace door is opened :and a floatcontrolled valve on the end of the pipe within the Water pan.

KERN WILLIAM LABKIN.

